The 'Message rules' dialog box lets you view all your blocked senders and also remove them from the list.

Managing Junk e-mail with Microsoft Office Outlook

To block a junk e-mail sender from the inbox: Right-click the message then go to 'Junk E-mail -> Add Sender to Blocked Senders List

Alternately, select the email, then go to Actions -> Junk E-mail -> Add Sender to Blocked Senders List

If you have opened the message in a new window and you would like to block the sender: go to Actions -> Junk E-mail -> Add Sender to Blocked Senders List

Once you have blocked junk e-mail senders, any future emails from them are sent directly to the 'Junk E-mail' folder.

If you accidentally blocked someone and would like to unblock them go to Actions -> Junk E-mail -> Junk E-mail options

The 'Junk E-mail options' dialog box lets you view all your blocked senders and also remove them from the list.